Control of cache memory - using validity bit change after delay to protect memory content against falsification

摘要

An on chip dynamic RAM memory is used as a cache memory in data processing systems and has data written into it in the form of working data together with a validity bit. The validity bit has to be reset after a specific delay period before the working data can be accessed. This prevents any changes or falsification of the data during the period. The cells of the memory are based upon capacitive elements and the validity bit change is determined by the charge period. ADVANTAGE - Controls working data against changes.